1.\" Copyright (c) 2006 Niclas Zeising 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd May 22, 2006 28.Dt IPFWPCAP 8 29.Os 30.Sh NAME 31.Nm ipfwpcap 32.Nd "copy diverted packets to a file in tcpdump format" 33.Sh SYNOPSIS 34.Nm 35.Op Fl dr 36.Op Fl b Ar maxbytes 37.Op Fl p Ar maxpkts 38.Op Fl P Ar pidfile 39.Ar portnum 40.Ar dumpfile 41.Sh DESCRIPTION 42The 43.Nm 44utility is used to copy diverted packets to a file in 45.Xr tcpdump 1 46format. 47The interesting packets are diverted by 48.Xr ipfw 8 49to a port on which 50.Nm 51listens. 52The packets are then dropped unless 53.Fl r 54is used. 55.Pp 56The options are as follows: 57.Bl -tag -width Ds 58.It Fl d 59Turns on extra debugging messages. 60.It Fl r 61Writes packets back to the divert socket. 62.It Fl rr 63Indicates that it is okay to quit if 64.Ar maxbytes 65or 66.Ar maxpkts 67are reached. 68Diverted packets will silently disappear if nothing is listening on the 69divert socket. 70.It Fl b Ar maxbytes 71Stop dumping after 72.Ar maxbytes 73bytes. 74.It Fl p Ar maxpkts 75Stop dumping after 76.Ar maxpkt 77packets. 78.It Fl P Ar pidfile 79File to store PID number in. 80Default is 81.Pa /var/run/ipwfpcap.portnr.pid . 82.El 83.Pp 84The 85.Ar portnum 86argument specifies which 87.Xr divert 4 88socket port to listen on. 89The 90.Ar dumpfile 91argument is the path to the file to write captured packets to. 92Specify 93.Sq Li - 94to write to stdout. 95.Sh EXIT STATUS 96.Ex -std 97.Sh EXAMPLES 98.Dl ipfwpcap -r 8091 divt.log & 99.Pp 100Starts 101.Nm 102as a background job listening to port 8091 and reflecting the packets 103back to the socket. 104.Pp 105.Dl ipfw add 2864 divert 8091 ip from 192.168.1.101 106.Pp 107Example 108.Xr ipfw 8 109rule to divert all packets from 192.168.1.101 to port 8091. 110See 111.Xr ipfw 8 112for details. 113.Sh SEE ALSO 114.Xr tcpdump 1 , 115.Xr pcap 3 , 116.Xr divert 4 , 117.Xr ipfw 8 118.Sh HISTORY 119The 120.Nm 121utility first appeared in 122.Fx 7.0 . 123.Sh AUTHORS 124.An -nosplit 125.Nm 126was written by 127.An P. Kern Aq pkern@cns.utoronto.ca . 128This manual page was written by 129.An Niclas Zeising Aq lothrandil@n00b.apagnu.se . 130